Knockdown boat



-Aug. 10 1926.

H. A. HOOKER KNocKnowN' BOAT Filed Oct. 26 1922 4 Sheets-Sheet 1 INVENTOR. liar/111414 00X?! BY a, 22

ATTORNEYS.

Aug. 10,1926. 1,595,096

' H. A. HOOKER KNOCKDOWN BU-AT Filed dt. 26. 1922 4 Sheets-Sheet 2 IN VEN TOR.

Z/ar Ql/oaker BY 4 zl A TTORNEYS.

Aug. 10 1926.

' 1,595,096 H. A. HOOKER g xnocxnown BOAT Filed Oct. 26. 1922 4 sheets-sheaf 5 INVENTOR.

Aug. 10 192s.

' 1,595,096 H. A. HOOKER KNOCKDOWN B-OAT Filed Oct. 26. 1922 j 4 Sheets-Shet 4 IN VEN TOR.

Y M 9 M ATTORNEYS.

Patented Aug. 10, 1926.

' HARRY anooknn, onwrnnnrirn, rr rlrnors.

rsaaeaa AT N QFFl-CF...

KnocKnownj oar. v

Application filed: October 26,1922. Serial No. 597135;

The main feature of my invention relates to a knockdown boat which may be; easily and quickly assembled and disassembled and which when assembled is'safe and seaworthy.

The inventionis particularly adapted to sm'all'boats and embraces a knockdown hull and a flexible watertight envelope fitted over the hull and removable therefrom whereby when the boatis assembled the hull provides a' substantially continuous support for the envelope against the pressure of the waterand affords substantially complete protect-ion't'o the envelope on the inside of the boat, and whereby when the boat is disassembled the envelope is disassociated with the hull withobvious' advantage in'packing and transportation.

Another'feature of the invention relates to a knockdown hull which may easily and quickly be assembledand disassembled'and which when assembled is rigid and well adapted for-its purpose. I I

With these features in view "my invention consists in certain features of novelty in the construction, combination, and arrangement of parts by which the said features and certain other features hereinafter appearing are effected, all as fully described with reference to' the accompanying drawings and more particularly pointed out in the claims.

In the said drawings r 'Figure 1 is a top plan view 'ofa knockdown boat embodying the features" of my invention.

Figure 2 is a central vertical section of the same withthe envelope removed for purposes of clarity.

Figure 3 is an enlarged partial perspective View of the boat with parts broken away.

Figure 4 is an enlarged detail view of one of the fastening devices.

Figures 5 and 6 are enlarged side elevations of one'of the interlock devices. Fig. 5 showing the device in released position and Fig. 6 showing the device in interlocked position.

Figure 7 is atop plan view of this device as shown in Fig. 6.

Figures 8' and 9 are perspective views showing another of the interlock devices;

Fig.8 showing'the device in released position and Fig. 9 showing the device in interlocked position. 7 r 1 :F igure 10 is a perspective view of another portion of the hull.

'Figure'll is a perspectiveview of still an other'portion of the hull. I

Likecharacters of reference indicate like parts in the various views.

The boat' shown in the 'lrawings is of the flat bottom type and the bottom of the hull is composed of a plurality of suitably shaped flat laminated wood pieces 1 assembled in edge to edge relation in sections longitudinally of'the hull with abutting end edges thereof disposed in straight transverse lines and with abutting side edges of the several sections staggered. These'pieces are of uniform thickness and when assembled form a continu'ous'o uter 'or bottom surface and a continuous upper or inner surface and are releasably'se'cured' together each to adjacent pieces by interlock devices comprising pairs of identical. interlock members 2. Each interlock member 2 is formed of metal and is ofright'anglesection. One angle 3 of each of theseinterlock members has one end reduced at the outer edge,f'a's' indicated at i, forming-an endwiseshoulder surface 5 facing outwardly toward the acent end, and the same angle has-at the other end a portion outward of the'base thereof turned edgewise with respect; thereto outwardlyof the outer face of the angle and then toward the base of the angle in spaced relation with the outer face thereof'as indicated at" 6. See Figs. 5 6, and 7 Thus are provided spaced interlock portions-facing transversely in oppositedirections,the one comprising a longitudinally extending upwardly facing forma- 'tiori, i. e., the reduced portion 4t of the said angle and the otherfcomprising a downwardly facingportion U-shaped in a transverse plane, i. e. ,-theportion 6 as related to the normal portionof the said angle forming a U-shaped formation. The interlock members being identical the' interlock formations are equally spaced and'whe'n'they are arranged'i'n proper longitudinal and in T- shape relationwith the outer faces of the angles 3 thereof-facing each other the portions 6 will'extend in front of the shoulders 5 and over the outer edgesof and down-the inner faces the reduced portions 4 of the angles3 whereby to rel'easably interlock the interlock members. See-Figs. 6 and Each pair ofinterlock members 2 are secured torespective pieces 1 bymeans of the portions of the other or base angles thereof corresponding withthereduced ends 0f the angles'2 thereof beingsecured against lock formation projecting outwardly beyond 1 the respective piece 1 and adapted to overlie the piece 1 to which its mate is secured, and are so positioned that they willinterlock with theopposing edges of these pieces abutting, the U-shaped downwardly facing interlock portions disposed at the projecting end of the interlock members interlocking with the upwardly facinginterlock portionsat the secured portionsv of the interlock members to releasably secure; the pieces 1; The interlock members when interlocked secure the pieces 1 ainst-relativeupward, edge- Wise, and separating movement and will .release with relative downward pivotal'movement of'the secured pieces anda-re engaged by reversal of the releasing movement'thereof. See Fig. 5. Thus-is provided a-sma-ll, light and effective. interlock device-which is easily and quickly interlocked and released and which is admirably adapted for the present purposes-.. v

The bottom of the hull resists 1 downward movement and cannot be disassembled f except by. downward pivotal movement of the bottom pieces 1 with respect to eachother. The bottom. pieces are arranged in sections longitudinally of the hull-with abutting. end edges thereof disposed in straight transverse lines and with the abutting side edges-of the several sections staggered for purposes of strength.

' Thebottom pieces 1 are suitable shaped to form when assembled-.awpointed prow end and a transverse stern edge. Thesides-of the hull are formed by-two series. ofsuitably shaped flat laminated wood pieces-8, and the pieces of each series are adapted to be assembled in end to end relation-along arespective marginal side edge. of the bottom to form a respective side of. the hull. A suitably shaped laminated wood stern piece- 9 is adapted to be assembled'on the marginal stern edge of the bottom-with its.- vertical end edges cooperating withthe rearend edges of the rear side pieces to form the stern corners." :The front end side pieces converge and form the prow, the' front ends thereof being reinforced by additional laminated wood pieces 11. secured to the inner faces thereof. The pieces'of each series of side pieces are releasably secured together one to another-by means of pairs of-the -interlocking members 52 secured against theinner .falces thereof: L and releasing-with outward pivotal movement of thes'ecured pieces with respect-'to-one.another. ..'l hese-interv locking members are identical with the in- See Figs. 5 and-6.' Eachterlocking members 2 which secure. the bottom pieces together and are secured to the side pieces in an identical manner.

The stern piece 9 and the side pieces 8 are releasably secured to the bottom and the .rear end side pieces are secured to the stern piece by means of interlocking devices, each comprising a hook member 12 and an eye member 13 having an upwardly ofl'set center portioneprovided with a slot 14 into which the doubled back portion ofthe hook member 12 is received. See-particularly Figs. 8 and 9. The shanks of the hook members secured against the inner surfaces of respective pieces by rivets 15 in the samemanneras the-interlocking membersEZ are se- .CUFQClntO their respective pieces, the center .12 and the ends of the eye members 13 are 1.

portions of the eye membersl? being spaced from the pieces to which they aresecured topermit the hook members to pass under neath the same and extend upwardly through the slots 14;. The interlock devices securing the side pieces ,8- to the bottom and l the stern piece 9 to the bottom are arranged to release with inward ;;facewise. pivotal movement of the side and sterngpieces with respect the bottom, see Fig. 8, and when interlocked the bottom edgesofsthe sideand 1 stern pieces engage the'upper surface of the bottom at the marginal :edges thereof as shown in Fig. 9. The interlock devices securing the rear endsidev pieces to the stern piece are'arranged-to release with inward facewise pivotal movement I of these side pieces with respect the sternpiece. See Fig. 1-1. The hook interlock devices which secure the rear end side pieces withthe bottom: are

disposed some distance forwardly of the being interlocked by warping the front portion. of the interlocked front end-sidev piece outwardly at the top to permit interlocking of the other. By reason of the arrangement the hull must be disassembled beginning with the front end side pieces. Secured against the inner faces of respective reinforcing pieces 11 in a manner hereinbefore described are-two eye members 13. Aihasp member 17 has its one end encircling. the.

portion of the center portion-of one of these last mentioned eye members on one side of a. The hasp member has a downwardly proecting angle portion 19 at the other end thereof which underlies'the center portion of the other of these eye members. The center portion of the hasp member is offset downwardly ant has a slot therein through which a staple 21, which is secured against 'the inner face of the underlying bottom piece, projects in a usual manner. A padlock 22 is engaged with the staple to pre vent upward movement of the hasp member to disengage the angle portion 19 from the respective eye member 13. This device prevents the disassembly of the front end side pieces and inasmuch as the front end side pieces must be disassembled first it prevents disassembly of the hull. The front ends of the front end side pieces are preventedfrom weaving movement by an eye member 13 secured against the inner face of one of the reinforcing pieces 11 in a manner hereinbefore described adjacent the top and an angle piece 23 having one angle thereof secured against the inner face of the other reinforcing piece 11 in a manner hereinbefore clescribed and having the other angle thereof engaged in the eye of the eye member to disengage therefrom with separating movement of the front ends of the front end side pieces.

Vertically disposed transverse laminated wood pieces24 are disposed in the hull in longitudinally spaced relation and are shaped to engage the bottom and side pieces traversed thereby. The pieces 24: are releasably secured in the hull by eye members 13 secured against the inner faces of the bottom pieces 1 in a manner hereinbefore described, hook members 12 secured against faces of the pieces 24 and adapted to engage the slots of the members 13 with face wisepivotal movement of the pieces 24, eye members 13 secured against the inner faces of the side pieces 8, angle members 16 having one angle thereof secured against faces of the pieces 24 and having the other angles thereof adapted to underlie the center portions of respective eye members 13 and an ranged to release therefrom with pivotal movement of the pieces 24 to release the interlocking devices securing the same with the bottom pieces, and releasable hook members 25 pivot-ally secured on the insides of the side pieces and adapted to engage the top edge portions of the pieces 2a to prevent releasing movement thereof. See Figs. 1, 2, 3, and 10. These transverse pieces 24secured to the side and bottom pieces provide support to the side and bottom pieces against relative upward or downward movement and support the side pieces against inward and outward facewise movement. The pieces 2% are preferably proportioned to force the sides outwardly to put the entire structure under stress and to bow the bottom of the hull outwardly from bow to stern as shown in Fig. 2. I

It will be observed that the hull includes a plurality of suit-ably shaped flat rigid pieces assembled into the form of the hull with face surfaces facing outwardly and releasably secured in said assembly. This construction permits of a structure affording a substantially complete outer hull surface with a reasonable number of pieces which may be conveniently packed for storage or transportation. The outer surfaces of these pieces are relatively disposed to form a continuous outer hull surface for purposes hereinafter appearing, and the construction, combination and arrangement of parts affords a light, strong, and dependable knockdown hull which is easily assembled and disassembled.

A flexible watertight envelope 26 is fitted over the hull to render it watertight and by reason of the outer hull surface being substantially complete a substantially continuous support is afforded to the envelope against the pressure of the water and in addition it is protected on the inside of the boat. Where as is shown the outer surfaces of the pieces composing the hull form are relatively disposed to form a continuous outer hull surface a smooth surface is presented to the water. 1

The marginal edge portion of the envelope is turned inwardly of the top of the hull and the envelope is extended completely across the topof the hull at the prow end, as designated at 27, forming a pocket into which the prow of the hull is disposed. See Figs. 1 and 3. Edge cuts 28 are formed in the marginal edge portion of the envelope at the stern corners thereof. These cuts permit fitting of the envelope on the hulland the removal thereof without stretching the same and accommodate shrinkage of the envelope. A pair of adjustable diagonal cross straps 29 are secured to the marginal edge portion of the stern portion of the envelope adjacent respective stern corners thereof and to the marginal edge portion of the envelope at respective opposite sides'of the hull some distance forward of the stern corners and function to draw the envelope longitudinally and transversely at the rear end thereof. Intermediate adjustable cross straps 31 are secured to the marginal edge of the envelope at opposite sides ofthe' hull to draw the intermediate portion of the envelope transversely. The straps29 and 31 are of usual construction and arereleasable to permit removal of the envelope. The cross straps 31 are arranged in pairs adjacently spaced, and secured to each pair of straps and to the diagonal cross straps intermediate the sides of the hull are seats 32 of large mesh fabric. Thus are provided comfortable seats, large mesh fabric being provided to permit the fabric to dry quickly when it becomes wet.

It will be observed that the cross straps 29 and 31 serve to maintain the envelope taut over the hull and in so doing serve to bind the hull structure together. Thus passengers sitting on the seats tighten the envelope and thereby bind the structure, The seat 32 which is supported on the diagonal cross straps 29 is substantially square and adjustable straps 33 are secured to the sides of this seat adjacent respective-rear corners thereof and to the marginal edge of the en velope at respective sides of the hull adjacent the stern corners thereof and aid in maintaining the envelope taut over the hull.

Oar lock brackets are secured against the inner faces of respective side pieces 8 and oar locks 35 are mounted therein.

While I have herein shown and particularly described the preferred embodiment of invention 1 do not wish to be limited to the precise details of construction shown as changes may readily be made without de arting from the spirit of my invention, but iaving thus described my invention 1 claim as new and desire to secure by Letters Pat ent the following.

Claims 1. A knockdown boat including a knockdown hull having a transverse portion at one end, a flexible watertight envelope fitted over the outer surface of the hull and removable therefrom, and having its marginal edge portion turned inwardly over the top of the hull and provided with marginal edge cuts at the corners of the hull formed by said transverse end portion and the sides, and a pair of adjustable diagonal cross straps secured to the marginal edge portion of the transverse end portion of the envelope adjacent respective sides of the envelope and to the marginal edge portion of the envelope at respective opposite sides of the hull some distance from said transverse portion.

2. A knockdown boat including a knockdown hull, flexible watertight envelope fitted over the outer surface of the hull and removable therefrom, and a cross seat structure secured to the envelope on opposite sides of the hull.

3. A knockdown boat including a knockdown. hull a flexible watertight envelope fitted over the outer surface of the hull and removable therefrom, and a cross seat structure comprising a pair of straps having their ends secured to the marginal edge of the envelope at opposite sides of the hull and a seat mounted on the straps and disposed intermediate the sides of the hull.

t. A knockdown boat including a knockdown hull, a flexible watertight envelope fitted over the outer surface of the hull and removable therefrom, and a cross seat structure comprising a pair of cross straps hav-.

ing their ends secured to the marginal edge of the envelope and a large mesh fabric seat secured to the straps.

A knockdown boat including a knockdown-hull pointed at its prow and having a flat transverse stern end, a flexible watertight envelope fitted over the outer surface of the hull and removable therefrom and formed to provide a retaining pocket at th, prow end thereof into which the prow of the hull is disposed, adjustable straps secured to the stern portion of the envelope,

adjacent respective stern corners thereof extend g diagonally therefrom at the top of the hull and secured to respective 0pposite side portions of the envelope some distance forward of the stern portion, and adjustable intermediate cross straps secured to the envelope at opposite sides thereof and extending); across at the top of the hull.

G. A knockdown boat including a knockdown hull pointed at its prow end and having a transverse stern end, a flexible watertight envelope fitted over the outer surface the hull and removable therefrom and formed to provide a pocket at the prow end thereof into which the prow of the hull is disposed and having theremainder of its marginal edge portion turned inwardly over the top of the hull and provided with marginal edge cuts at the stern corners thereof, a pair of adjustable diagonal cross straps secured to the marginal edge portion of the stern portion of the envelope adjacent re spective stern corners thereof and to the marginal edge portion of the envelope at respective opposite sides of the hull some distance forward ofthe stern corners, and adjustable intermediate cross straps secured to the marginal edge of the envelope at opposite sides of the hull.

7. A knockdown boat, hull including a plurality of flat laminated wood pieces adapted to be assembled into the form of the hull with face surfaces thereof forming the outer surface of the hull, a plurality of interlock devices and releasable means for preventing release of said interlock devices for releasably securing said pieces together each to adjacent pieces in said assembly and comprising members on the insides of and secured to said pieces, vertical transverse laminated wood pieces in the hull, interlock devices for securing said transverse pieces to each of the first mentioned pieces traversed thereby and including members on the insides of and secured to said first mentioned pieces and complemental members secured against faces of the transverse pieces, and releasable means for preventing release of the last mentioned interlock devices.

said assembly and adapted to release upon releasing movement of the secured pleces with respect one another, and means cooperating with said interlock devices to releasably secure said pieces in assembly to form a rigid hull and adapted to prevent releasing movement of the bottom pieces with respect one another including devices releasably securing said second plurality of pieces with the bottom.

9. A knockdown boat hull including .a plurality of flat rigid bottom pieces adapted to be assembled in edge to edge relation to form the bottom of the hull, a second plurality of flat rigid pieces adapted to be assembled in upstanding relation with the bottom to complete the hull, interlock devices disposed interiorly of the hull for releasably securing the bottom pieces together each to adjacent pieces in said assembly and adapted to releaseupon downward pivotal movement of these pieces with respect one an-- other, and means cooperating with said interlock devices to releasably secure said pieces in assembly to form a rigid hull and adapted to prevent releasing movement of the bottom pieces with respect one another including interlock devices disposed interiorly oi the hull and releasably securing said second plurality of pieces'with the bottom and adapted to release with facewise pivotal movement or" these pieces with respect the bottom.

10. A knockdown boat hull including a plurality of flat rigid bottom pieces adapted to be assembled in edge to edge relation to form the bottom of the hull, a second plurality of flat rigidpieces adapted to be as sembled in upstanding relation therewith to complete the hull including two series of side pieces, the pieces of each series of side pieces being adapted to be assembled in end to end relation to form a respective side of the hull, interlock devices'for respectively releasably securing the bottom pieces to-. gether each to adjacent pieces in said assembly and the piecesof each series of side pieces one to another in said assembly and adapted to release upon outward pivotal movement of the secured. pieces with respect one another, and means cooperating with said interlock devices to releasablysecure said pieces in assembly to form a rigid hull and adapted to prevent said releasing movement of the side and bottom pieces including interlock devices releasably securing a second plurality of flat rigid pieces 'adapt- V I ed to be assembled in upstanding relation with the bottom to complete the hull ineluding two series of side pieces, the pieces of each series of side pieces being adapted to be assembled in end to end relation to form a respective side of the hull, interlock devices for respectively securing the bottom pleces together each to adjacent pieces in said assembly and the pieces of each series of side pieces one to another in said assembly and adapted to release upon outward pivotal movement of the secured pieces with respect one another, and means cooperating with said interlock devices to releas ably secure said pieces in assembly to form a rigid hull and adapted to prevent releasng movement of the bottom and side pieces lncluding additional interlock devices releasably securing said second plurality of pieces with the bottom and adapted to release with pivotal movement of these pieces with respect the bottom.

12. knockdown boat hull including a' plurality of flat rigid bottom pieces adapted to be assembled in edge to edge relation to form the bottom ofthe hull, a secondplu- 'rality of flat rigid pieces adapted to be assembled in upstanding relation with the bottom to complete the hull and comprising a stern piece and two series of side pieces, the pieces of each series of side pieces being adapted to be assembled in end to end relation to form a respective side of the hull and the forward end side pieces converging to form the prow, and means for releasably securing said pieces in said assembly in cluding a releasable means securing'the forward end side pieces together and a plurality' of interlock devices cooperating therewith to releasably secure said pieces together each to adjacent pieces, said interlock devices being arranged so that said releasable device prevents release thereof.

13. A knockdown boat hull including a plurality offlat rigid bottom pieces adapted to be assembled in edge to edge relation .to form the bottom of the hull, a second plurality of flat rigid pieces adapted to be assembled in upstanding relation with the bottom to complete the hull and comprising a stern board and two series of side pieces, the pieces of each series of side pieces being adapted to be assembled in end to end relation to form arespective side and the for ward end side pieces converging to form the prow, interlock devices securing the bottom pieces each to adjacent pieces in said assembly and the pieces of each series of side being arranged'so that said releasable device prevents release thereof.

14. A knockdown boat hull including a plurality of fiat rigid bottom pieces adapted to be assembled in edge to edge relation to form the bottom of the hull, a second plurality of flat rigid pieces adapted to be as sembled in upstanding relation with the bottom to complete the hull and comprising a stern piece and two series of side pieces the .pieces of each series of side pieces beingadapted to be assembled in end to end rclation to form a respective side of the hull and the forward end side pleces converging to form the prow, a plurallty of releasable devices for releasably securing said pieces together each to adjacent pieces, rigid transverse members in the hull, and releasable devices for releasably securing said .trans-' verse members in the hull.

15. A knockdown boat hull including a plurality of flat rigid bottom pieces adapted to be assembled in edge to edge relation to form the bottom, of the hull, a second plurality of flat rigid pieces adapted to be assembled in upstanding relation with the bottom to complete the hull and comprising astern piece and two series of side pieces, the pieces of each series of side pieces being adapted to be assembled in end to end relation to form a respective side of the hull and the forward end side pieces converging to form the prow, interlock devices securing the bottom pieces together each to adjacent pieces in said assembly and the pieces of each series of side pieces one to another in said assembly and adapted to release upon outward pivotal movement of the secured pieces with respect one another, interlock devices securing the side pieces andthe stern piece with the bottom and the rear end side pieces with the stern piece and adapted to release with facewise pivotal movement of the side pieces and stern piece with respect the bottom and with facewise pivotal movement of the rear end side pieces with respect the stern piece, a releasable device securing the forward end side pieces together, said interlock devices'being arranged so that said 7' releasable device prevents release thereof, fiat rigid vertically disposed transverse pieces in the hull, interlock devices for reto the side and bottom pieces traversed thereby and adapted to release with facewise pivotal movement of the transverse members, and releasable means preventing reposed in straight transverse lines and with abutting side edges of the several sections staggered, a second plurality of fiat laminated wood pieces adapted to be assembled in upstanding relation with the bottom to com-' plete the hull and comprising a stern piece and two series of side pieces, each series of side pieces being adapted to be assembled in end to end relation to form a'respective side, the forward end sidepieces converging to form the prow, interlock devices securing the bottom pieces each to adjacent pieces in said assembly and the pieces of each series of side pieces one to another and adapted to release upon outward pivotal movement of the secured pieces with respect one another, interlock devices securing the side pieces and the stern piece with the bottom and the rear end side pieces with. the stern piece and adapted to release with facewise pivotal movement of the side pieces and stern piece with respect the bottom and with facewise pivotal movement of the rear end side pieces with respect the stern pieces, a releaseable device securing the forward end side pieces together, said interlock devices being arranged so that said releasable device prevents release thereof, flat vertical disposed transverse laminated wood pieces in the hull, interlock devices for releasably securing said transverse pieces to the side and bottom pieces traversed thereby and adapted to release .with facewise pivotal movement of the transverse pieces, and releasable means preventing releasing movement of said transverse members, said interlocking devices, said releasable device and said releasable means including members on the insides of the first and second mentioned plurality of pieces and secured thereto.

17 A knockdown boat hull including a plurality of suitably shaped fiat rigid bottom pieces adapted to be assembled in edge to edge relation to form the bottom of the. hull and forming a pointed prow end and a' transverse stern edge, aplurality of suitably shaped fiat rigid pieces adapted to be asleasing movement of said transverse memleasably securing said transverse members.

sembled in end to end relation along the marginal side edges of the bottom and meet ing at the bow to form a pointed prow, a suitably shaped rigid stern piece adapted to be assembled along the transverse stern edge of the bottom with opposite edges thereof meeting the rear end edges of the sides, means detachably securing the adjacent edges of said pieces together in said assemeluding a pair of complemental members each of which is provided with two longitudinally spaced interlock portions facing transversely in opposite directions, the interlocked portions of each member being adapted to interlock with respective interlock portions of the other member at the same time whereby to releasably secure the members, each pair of interlocking portions comprising a longitudinally extending formation and a U-shaped portion adapted to receive said longitudinally extending portion.

19. A device of the character described including a pair of complemental members each of which is provided with two longitudinally spaced interlock portions facing transversely in opposite directions, the interlock portions of each member being adapted to interlock with respective interlock portions of the other member at the same time whereby to releasably secure the members, each pair of interlocking portions comprising a portion U-shaped in a transverse plane and a longitudinally extending portion adapted to engage in said U-shaped portion and terminating in a shoulder surface uprising therefrom and disposed at the endv thereof adjacent the other interlocking portion of the respective member to be engaged by the U-shaped portion when the members are interlocked.

20. A device for releasably securing two pieces including a pair of complemental members secured against corresponding surfaces of respective pieces with portions thereof projecting outwardly beyond respective pieces and adapted to overlie said corresponding surfaces of respective opposite pieces, and means including downwardly facing interlock formations on the extending portions of said members and complemental upwardly facing interlock formations on the secured portions of said members adapted to respectively interlock for releasably interlocking said members.

21. A device of the character described including a pair of complemental members of right angle section, one angle of each member having a portion outward of the base of this angle turning edgewise with respect thereto outwardly of the outer face thereof, said portions being adapted and arranged so that when the members are arranged side by side in T-shape relation with the outer faces of said angles facing each other each of said portions will each extend over an upright portion of the said angle of the other member for releasably interlocking the same.

22. A device of the character described including a pair of complemental members of right angle section, one angle of each member having a portion outward of the base of the angle. turned edgewise with respect thereto outwardly of the outer face of the angle and then toward the base of the angle in spaced relation with the outer face there of, said portions being adapted and arranged so that when the members are arranged side by side in T-shape relation with the outer faces of said angles facing each other these edgewise turned portions will extend over the outer edges of and down the inner faces of said angles for. releasably interlocking the same, said members being provided with endwise facing shoulders equally spaced from and facing away from the edgewise turned portions of respective members and disposed so that said edgewise turned portions extend in front of the same for engagement therewith when the members are interlocked.

28. A device of the character described including a pair of complemental members of right angle section, one angle of each member having a corresponding end reduced at the outer edge forming an endwise shoulder surface facing outwardly towardthe adjacent end, the same angle of each member having at the other end a portion outward of the base thereof turned edgewise with respect thereto outwardly of the outer face of the angle and then toward the base of the angle in spaced relation With the outer face thereof, these edgewise turned portions being equally spaced from the said shoulder surfaces of respective of said angles and adapted so that when the members are arranged side by side in proper longitudinal and in T-shape relation with the outer faces ofsaid angles facing each other these edgewise turned portions will extend in front of said shoulder surfaces and over the outer edges of and down the inner faces of said reduced ends of said angles whereby to releas ably interlock the members.

In witness whereof I hereunto afiiX my signature this twenty-first day of October, 1922, A. D. I

HARRY A. HOOKER. 

